From: jamie_ka1lpa@charter.net   
      
   In article , no@spam.com says...   
   >   
   > On Sun, 08 May 2016 15:13:56 +0100, M Philbrook    
   wrote:   
   >   
   > > In article , no@spam.com says...   
   > >>   
   > >> I know what a servo motor is, and that you can get servo amplifiers (or   
   servo drives) to work with them, but what does it mean when a stereo system   
   says it has a servo amplifier?   
   > >   
   > >  The amp is the part that actually handles the high currents in the   
   > > motor coils.   
   > >   
   > >   The rest of it before that is the controller that generates the   
   > > signals and monitors the motor's position vie the internal feed   
   > > back sensors of the motor.   
   > >   
   > >  The control could be programmed to generate signal steps per step   
   > > command or scaled, meaning that multiple steps can be generated per   
   > > step command.   
   > > One step of the motor normally is governed by the type of motor   
   > > and its feed back system..   
   > >   
   > >  For example, systems with internal encoders of 5k or more per   
   > > turn have step spaces of 5K or more. etc..   
   > >   
   > >  The amplifier can be a dummy type or it could have additional   
   > > functions for current controls for step move and control settings   
   > > for holding positions etc. Normally additional IO is set up to   
   > > trigger these options from the controller itself.   
   > >   
   > >  It's best to get the controller and amp together as one. Also   
   > > depending on the system of design in mind, you can op for a   
   > > master power supply to serve a rack of servo drives or get   
   > > stand alones.   
   >   
   > Er yes.... but I have a stereo system amplifier which mentions servo.    
   There's no motors involved.   
      
   You must be referring to using a dual amp in bridge mode to drive a DC   
   motor for positioning an actuator ?   
      
    That being the case, you need a feed back for the position that acts as   
   the voltage comparator feed back signal to the control input amp.   
      
      
    Something in the line of RC (radio control)supplies can get you those.   
      
   Jamie   
      
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